At what age can you tell for sure if you have a roo or a hen?

[Totes Quackers]

I have 6 hens, they range in ages from 22-28 weeks, the eldest has just started laying and I'm confident that 4 others are hens, however there is one I'm still not sure about, 'Hyde' is about 24 weeks, would I know for sure at this age if it is in fact a roo? Would it be really obvious by now? I don't know how to post a pic?

 

[blefky]

Some birds can be tricky to sex, but by the age of your birds it should be apparent. New members cannot immediately post pics, it has to do with keeping spamming to a minimum. When you're abe, you can go to the "uploads" link on the top blue bar and once there click on "browse", from the list that appears, find the pic you want to upload and double click on it. You then click "submit", when you see "image uploaded successfully", look at the box that says "images" and highlight, copy and paste it onto your post. Sounds more complicated than it is, and once you do it you'll see it's easy. There are many experienced members on the forum, so when you're able to post pics I'm sure you'll find help. Good luck with your birds, and

 

[Totes Quackers]

Thankyou!
I posted a pic to the Facebook page and so far have received 2 replies of 'Roo', but I'm still hoping it's a hen. When I can I will post a pic in the forum.